Jackson, Washington’s longtime safeties coach, and McCardell, the Redskins’ wide receivers coach the past two seasons under Shanahan, were informed Monday they would not be offered new contracts. Jackson and McCardell, the sources said, were not among several assistants who received contract extensions at the beginning of the season.

Apparently, Shanahan intends to bring back the majority of the group that has an 11-21 record during his two seasons leading the organization.

Shanahan and his staff will lead the South team during the Senior Bowl on Jan. 28 at Mobile, Ala. It is unclear whether Shanahan plans to fill the openings quickly, the sources said.

Hired by Joe Gibbs, Jackson has been with the Redskins since 2004. He has coached safeties the entire time.

Shanahan retained Jackson after he replaced former coach Jim Zorn, who went 12-20 in two seasons. Standout safety LaRon Landry has credited Jackson with much of his development.

With Landry and O.J. Atogwe sidelined most of the season because of injuries, the Redskins’ secondary struggled at times while relying on backups. An area of strength for Washington beginning the season, safety is now a position of concern.

Shanahan hired McCardell, a former Redskins wide receiver, to be part of his first Redskins staff. McCardell has generally received high marks from players, and he had a key role in Anthony Armstrong’s surprising 2010 season.

This season, McCardell worked closely with Jabar Gaffney. The 10-year veteran set career highs with 68 receptions for 947 yards, and matched his personal-best total with five touchdown receptions.